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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c6e42617ba6a073e2972d68c4346f453a8d3e89941c212ba805d34c1fdb365c' 
  AND token = 'Y59DOjYaWptDILAA/s/hrt951IUFeeOt4jZ2njf192M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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