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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc80c623a4f07d550189f5f94596fc9391d2149af127fbebdf3d7e5d198d696' 
  AND token = '71BnGn6oXGUe/TfKVWLn9r1EWLEVQ2v91opkAaJ+NZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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