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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '511b41b4a0d856361afc2f5afa8d2e7da6008f96e3d0be7cc2ab4f4cd3611dba' 
  AND token = 'L7Ri4jlGbvsve4sQJ2IMRgKm32dMZveuRdLgioWfprQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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