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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2520b55d25e71ba5eadf0c6666d8cc616a2254e1deb27e948c78cca2aa7de0e4' 
  AND token = 'P8iGSQKyE8dAJb57S6z4OKHVP1iJJTTHZk/7Mp6457k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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