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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1940dd5738ba34986cf582990baba03ab41783d8d2059b723a0779f43b104c4d' 
  AND token = 'eeD76+6S1a36pVTzGK11QywJhp8N8Y5gdTB65tuOkfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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