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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a604c4f4b826794dddd5f90ceef4c1e361e026857d4ff3b2f3776830cc4a8e06' 
  AND token = 'd1quPTYxS/YjYMgNfQdOzubdo7Hj318mncgQCaLKyjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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