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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10e45f55caa68ceb2a9c3fe07b7a4b8c5a9dc0f13fc1a927ea3cdc2c4d447809' 
  AND token = 'Et7BRjwckEFxdP3bEMbcVTfIuwWAFuXDeJKDLIk2gU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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