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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd212da6ec762dc3c1c19f56029be438afa2630406ab62a92302641564ccb2492' 
  AND token = 'f3SOQGG0ICDKoJpywtnkIYUE5iAFohQIXG5ojHmEj3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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