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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf02bdcb3879a99b165699a5bb4d56882bac9c7a160c0d7e0ad39c057ce34ce' 
  AND token = 'NkX8WrxVI8PSbnxOoRtoFTFeg7EHxsjSPR6Z71NYzsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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