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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a6e86edbe7eb3b63ec258052c785e1ef1a502cc5bde6195bb9c81b5225691f6' 
  AND token = 'qzbSMgdwWkkn+GYHBJDospFoZ+ugd4V3bsd729e6ync=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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