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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12daf2f1dda0f482679df46c5ce1dc86e701a5de1df2cc333ac45eacc7a68b3e' 
  AND token = 'kPSUDL61AHl6vN9nY/lu5bq0JLpI5dJ5Saiue9N9HOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00122

JSON explain

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