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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f171ca1d9651284dce65aa10e5d433a97f2abe2983f9d1991af774a23a4363' 
  AND token = '/3u8iFhXIxKdeSgivKOPaoo+tr7f7gGm5wW0MqZTChM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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