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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faad0b3401376371a4a410e0daa26d3a1b98735dd828cb34eb1a9f0d80b97c32' 
  AND token = 'mCIJLkDn/3+kgdQHDvIaF5CZuBQ0iKsiEjLA9KFiuVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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