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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f805f689f080c5a527126205898f0a61b84d7bcadfe4e46da96635c2ab533ed7' 
  AND token = '3AQeyaBj9xvruLNa6Mkz6zIjbAe4fMBAN98e0tLInNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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