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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57e90fd267c77eb17582ffc57ddc7514c8008d5baa549140ec12daa62aed1733' 
  AND token = 'B968lxXbASUAov02VG6YY9LYc0AIAPRiTp50BJrTKhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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