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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e856c9a925c193292249573c16a365ee7e4805add891bfe941b57b047e984372' 
  AND token = 'T73VdG3nqoXW0NqGUmbf9cJh0+6fMAAl3TN1QkwMdaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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