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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9960c6909516abd491f4ab3f5ce65153b683050066c3f2dc8ed830c7c21c19c1' 
  AND token = 'elJ0BD6BeOdW8YzuNx1lRK+ETuCA5qOvA3U6RzV66Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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