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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8de26a660390a800ab9e089f62043d62b0186dd42ee81612445765540da89e2d' 
  AND token = 's/Q6WGyrM2TIOyTi/z5ILu9VtP/87LD+6QSHRNOh6GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}