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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ea22c02104ff5b20201cb56befe9346286ecc94858e16d3725f59579b00607f' 
  AND token = 'WpEtaWkST1yq908OHJaaqIZmyTMg/SIRD/2BE6kkXpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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