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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c054141183435341b2012d9c28726136a13d4eae68c98e5adfb3eb80226a67f8' 
  AND token = 'bRk0fAcVa+Rox6i8ngiYijYPAdyGIt2f1TeYU6KdPi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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