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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f332160b3432ff3c5aab69594c0eb2fb7bb3796e4eb77a83c8821281bd05ae' 
  AND token = '1bLas9ZIt3U2Y04Dn1/tig0xwu/kI8LcHjK4+YzLDG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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