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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47665f4e267b311e9c21122b7a19eb706ff93f90ec48b80468869ede2ad43f7e' 
  AND token = 'HLxLqRQzuf3fxJA/tkoad7t3CvA3RaNXTauh0E2kxXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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