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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ee89ad709344a83ab7e8b035b6f170b7f61f3f684dda04be1504fc340343264' 
  AND token = 'N1r7ogFSfy2zvKzzk3h9iH4Nz+BCRHdiykyX7KOWFFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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