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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f9b4fc46dd8adf455044f9be06269e5fad2a92c6fed537bd103c573359d335a' 
  AND token = 'W3dp93RojtkBG5mghIINQ497M8BXZMBkj1ar0Ks7ptw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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