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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb6821844edf45ae08aa45171e4e007fb148bab1b600cae3cbd7f0659768c1ec' 
  AND token = 'M1LadiGWzVV2CFnFn6uUGBt/b3vKAQCk6ytE9ffOaXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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