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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f3d47a75af2059cbba0c0c3d28e3ff57fd92aff47c52d1b5b4a92505a85d71' 
  AND token = '76NeNLVosZ1lUwsmIK/6kPnpufTTSXfKZsz6iUpXXAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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