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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d16a8f2d46a65b4b93f838f15a99d0d9966709252a0d99d8223820b202af876' 
  AND token = 'R3SftwBYoN/DshPlQ3mKeW1reZT9W1p5tyCAgcVKkaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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