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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '665b3f85fa1ad8b8a51fafd38191305510a698ca152627b83583d95732da6e17' 
  AND token = 'O3WkQj4bV52VvXpS6y77gyhZSRRgcBhu9/psk2Ohr6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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