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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055ee74ccf7c88bd52bb538616b03b9bb32b1eed0f816dd2ae31cc79786dbe03' 
  AND token = 'ZqmO6nM3ocsE7FLCtlMJovLed9au1EgfVHiROLiKL/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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