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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a71697cbddfec1c0f82dac2ce93ec77585e22b12e3c08e356533f68c9887c1' 
  AND token = 'jtH1EsmhSC0DQ2LR/Hdm7Eo+NzS9V9TpdQELHlKUZfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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