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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9bf8668cc47f4c1c2a94645410249e55f4e789627073502096f32edd16036ae' 
  AND token = 'T0ngTvbDlulhNhegEVIuiQoilo+glOrr2nn6lQ9GzUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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