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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c618b1c1e658dd7acb2520721f3765a349a011e962452f20a1ca31c84f571785' 
  AND token = 'SYrF5CNWqw4yiZpld2rcf1K9Sp9Fa5GfyBI06D/p/+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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