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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '880da2f4990e39ebcc3a6b09f537a7399eaf183777c7a27ed3dfcb52eda3d33f' 
  AND token = 'n1TUoTWYhnLXy/5QzD040Tb9DCQsC7VHRsRZzG9J+pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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