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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41bb138179ea37100c7bc25626b2b6e0c747ea4896c6e1aeb4788a599575cb0d' 
  AND token = 'QB0Lz13MWCLBGYvA7Bg05tS1VqRthoML8WZCDxjbo7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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