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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac523fcb8eec523caa49526a811ee4206f4532424bbf7d2c7db69fdaba65abd' 
  AND token = 'kgFEepYWNpZhj+yKjHXxF8d1nkc0tP4M+wpdV38SNw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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