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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f91fdca59394575e5760d45e9bb7e3dee7ec37025e73cc39756720825b480754' 
  AND token = 'ti1cQS+vJORGbsqNFgEvWrGaI06DvaLhhHchC7G8rzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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