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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5f91a28eda06255a34ab317acfc44f398f0ae544ca6a2b8b44068ce670b3ac' 
  AND token = 'Rdc0xP9SE7cN8mKN8brqFbwaay9ZUA35zrcacZYzmZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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