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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0930ee90f7dfefb7ee81e31ccf4605c54c7587d2ab61b6d1e9310860308a06f4' 
  AND token = 'ippIs6qFaPIzJZeZwp+INDr35vbu5AzNtMepYWjeavw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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