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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acbd520de323ded79482aa03056d0de9af20a914a4389d9cafc030ac462703c0' 
  AND token = '8Q5EkMF7TxAsAwU7SJnN+1kY5U0buLUy3KXW9Se6XxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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