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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ce3bf98cb9328df265b138b4d22593f3501beddf0affcb4c9bc056331daa62' 
  AND token = 'W7V0lDl1dzMipQMeBGwhf8Y4dw2FISIIZOhAEElz+d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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