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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '376126b58da210df9acbcf443434fd89b2ce2a3f5558013a6c480a63fabdacd2' 
  AND token = '5zDDe/Q8yXAN1HjeyL5RHogN4VDrVkK2DkBHjr9rnME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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