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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b3500411e54044ef88146e6f41185e33a055ae904dda0ee0ebee830fe8a8e3' 
  AND token = '0s1D5747gvdhJ7lplCv6nVKr1IjuvlwFWR1rrtZKGjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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