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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a578e42e4e16105de5a744a0b368b12d3a8c1dbfa4708f3e32bd15041f34f83' 
  AND token = 'd+YXc4V/L8I9EH6UnSM6UQ44pgVpBYE9k454u0PPtYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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