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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '352e49ef626d9e8192ec6ff254d9c425ed60cb0a77cd50ccc0dd63873cf80b15' 
  AND token = 'E329xpTo88K2Mq4bOjByc4uCYdr7s49XE43GC6RcZCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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