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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd080885307c2a92caf54650e90e24adfe7bbb8e63ddab29b72c005c5a4298db5' 
  AND token = 'fl3cvQanAqsSoLU4/lacsA7cxin4YgsMTO/TAJY8iG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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