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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '601c04c984bd3c0ce1bc481c57f65220ea7e30d41cfebcbbfd0680779f44ca9b' 
  AND token = '6ZOuNqOvSdSC4w+ktYkNyQTcCEQszYSJexvwFYFTfVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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