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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b6492a7d77d00440e6206206c51b4cd66ce553820bf67b097355bde9fa42d6e' 
  AND token = 'v7Uzz9rqYGG/tkamfzokwk2DIjF/jESEv9iSRubcE+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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