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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '893eaea40587b86c004131438e440fbf69b0f126b21e6e412fc52f89ba9e4722' 
  AND token = 'HyZVEmrKUKk6D1bGlBr7M04GW0rrrK9pJIlAgnv6e0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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