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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12f8b57aca547c1ab4daa526a43763f7866ffb647696266748790b8a1b8a515e' 
  AND token = 'H4CnwNlQ6n8A0ZOS2r4+qpz7n8aqVKTgRD8aH/KV+WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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