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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe95b97d68a7a6f013191a32b2972b769fd2cc58cdbe9a550b887d099c9f2f8d' 
  AND token = 'lk2dDF38IJulwP3xDUI1LTR0g4wXTYF8adPME0j+5gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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