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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3422b199de1bbc951974c9d5ce9b646ebd686a12b9051dea88e0d6ed599cfba2' 
  AND token = 'kR2uRB+q701uIQsIq6WC97hZtlCLId4UGKvTvkaLVJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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