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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd78ee1b2b8e5df1997fc749757f44eaedeeb31c2a39b6b9f419eda41b6421377' 
  AND token = 'ETo/9hIdXAzHy71Yn1GdvFpsxh9lnx/LbcsTgbC43d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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