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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'badb109e7f4b37978f4b7027a8504b23e57469f74f66148ec0ff2adc62bc8054' 
  AND token = 'Ooh1RIfxbQod/VXBXCK9Mf5EPDEezLrL/nZUL3Q0/q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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